The patch below does not apply to the 3.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From c4eadfafb91d5501095c55ffadaa1168743f39d3 Mon Sep 17 00:00:00 2001
From: Christophe Ricard <christophe.ricard@xxxxxxxxx>
Date: Tue, 13 Jan 2015 23:13:14 +0100
Subject: [PATCH] tpm/tpm_i2c_stm_st33: Add status check when reading data on
the FIFO
Add a return value check when reading data from the FIFO register.
Cc: <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jason.gunthorpe@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Christophe Ricard <christophe-h.ricard@xxxxxx>
Reviewed-by: Peter Huewe <peterhuewe@xxxxxx>
Signed-off-by: Peter Huewe <peterhuewe@xxxxxx>
diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 48c4808d5a7a..4f70296f3a7f 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -441,7 +441,7 @@ again:
*/
static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
{
- int size = 0, burstcnt, len;
+ int size = 0, burstcnt, len, ret;
struct tpm_stm_dev *tpm_dev;
tpm_dev = (struct tpm_stm_dev *)TPM_VPRIV(chip);
@@ -455,7 +455,10 @@ static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
if (burstcnt < 0)
return burstcnt;
len = min_t(int, burstcnt, count - size);
- I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
+ ret = I2C_READ_DATA(tpm_dev, TPM_DATA_FIFO, buf + size, len);
+ if (ret < 0)
+ return ret;
+
size += len;
}
return size;
--
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